1976 360 and trans opinions wanted

Thanks for the replies,all. I'm not really too familiar with the different "eras" of 360's. I've been a 273 guy mostly. I have heard some years are good,and some years to avoid. Will it be an externally balanced engine or internally balanced? I'm hoping my 904 trans will bolt up as it fits the trans tunnel better than the 727. Are there any other things to look for with this engine and trans? Apparently, its still in the motorhome chassis,and is driveable, but most of the motorhome body is gone.